Sounds like you need a nylon muzzle. I have no patience for biting dogs. Got bit by a Shepherd while riding my bike as a kid. Needed stitches. Too many good dogs out there, i will not keep a biter. Gosh, i am a crabby old lady. Must be my ribs bugging me. Good luck with your dog. If you get the collar on and hook him up tight to a post he will have a hard time fighting you.he has stated to bite 2xs . He dont like Robert much .